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| 单位空间 | |||
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unit space : 36 phrases in 9 subjects |
| Aviation | 1 |
| Construction | 2 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Space | 20 |
| Technology | 8 |
| United Nations | 1 |
| United States | 1 |
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